AD40328 has anyone got any info on this op-amp?

jez · 5th April 2011, 03:47 PM

Anyone have a datasheet for this op-amp made from pure unobtainium?
Google draws a blank.... just various far east companies claiming to be able to get one, non of which has a data sheet or price.... very dubious.
Just want data on it, not IC itself as can probably find something to replace it with if I can get data for it!

lineup · 5th April 2011, 04:05 PM

Could have been AD4032B or AD40328
But neither can be found by me.
Haven't heard of it.

jez · 5th April 2011, 04:28 PM

It's AD40328 for sure. No I've never heard of it either but it does exist cos there's 3 of them in the Bruel & Kjaer 2610 measuring amplifier I'm trying to repair!

lineup · 5th April 2011, 05:27 PM

I did a search at Analog Devices website.
Analog Devices | Semiconductors and Signal Processing ICs
But no luck. Even there.

jez · 5th April 2011, 07:57 PM

erm....yes... I did say it's not to be found on the web....

jez · 5th April 2011, 08:01 PM

dated 1980 and in T099 metal can if that helps anyones memory !

mlloyd1 · 5th April 2011, 11:47 PM

i suspect the last digit is not an 8.

how about this ic: Qservice Electronics, Fluke Spare Parts For Test Equipment scroll down to
AD40323

it can be a part specially marked/selected by ADI for someone. if so, good luck finding info ...

mlloyd1

jez · 6th April 2011, 10:47 AM

oh it's an 8 alright.... have looked very carefully through a large magnifying glass at all 3 of them and yep, no doubt it's an 8.
Looks like it will remain a mystery op-amp!

davebullock · 15th May 2012, 03:34 PM

Hi B&KMeasuring Amplifier owners....
Looks like it's a B+K part number.

The actual IC is an LM201AH.
Slghtly less rare than unobtanium.
I just replaced all my AD40328's with the aforementioned IC and the performance is great and up to B+K specification.
Hope this helps other B+K owners.
Dave

5th April 2011, 03:47 PM	#1
jez diyAudio Member Join Date: Jan 2004 Location: n.e england	AD40328 has anyone got any info on this op-amp? Anyone have a datasheet for this op-amp made from pure unobtainium? Google draws a blank.... just various far east companies claiming to be able to get one, non of which has a data sheet or price.... very dubious. Just want data on it, not IC itself as can probably find something to replace it with if I can get data for it! __________________ Repairs and mods to Real Hi-Fi, guitar amps and P.A. in North East England. http://www.arklesselectronics.com

5th April 2011, 04:05 PM	#2
lineup diyAudio Member Join Date: Dec 2005 Location: the north	Could have been AD4032B or AD40328 But neither can be found by me. Haven't heard of it. __________________ lineup

5th April 2011, 04:28 PM	#3
jez diyAudio Member Join Date: Jan 2004 Location: n.e england	It's AD40328 for sure. No I've never heard of it either but it does exist cos there's 3 of them in the Bruel & Kjaer 2610 measuring amplifier I'm trying to repair! __________________ Repairs and mods to Real Hi-Fi, guitar amps and P.A. in North East England. http://www.arklesselectronics.com

5th April 2011, 05:27 PM	#4
lineup diyAudio Member Join Date: Dec 2005 Location: the north	I did a search at Analog Devices website. Analog Devices \| Semiconductors and Signal Processing ICs But no luck. Even there. __________________ lineup

5th April 2011, 07:57 PM	#5
jez diyAudio Member Join Date: Jan 2004 Location: n.e england	erm....yes... I did say it's not to be found on the web.... __________________ Repairs and mods to Real Hi-Fi, guitar amps and P.A. in North East England. http://www.arklesselectronics.com


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5th April 2011, 08:01 PM	#6
jez diyAudio Member Join Date: Jan 2004 Location: n.e england	dated 1980 and in T099 metal can if that helps anyones memory ! __________________ Repairs and mods to Real Hi-Fi, guitar amps and P.A. in North East England. http://www.arklesselectronics.com

5th April 2011, 11:47 PM	#7
mlloyd1 diyAudio Member Join Date: Feb 2001 Location: illinois	i suspect the last digit is not an 8. how about this ic: Qservice Electronics, Fluke Spare Parts For Test Equipment scroll down to AD40323 it can be a part specially marked/selected by ADI for someone. if so, good luck finding info ... mlloyd1

6th April 2011, 10:47 AM	#8
jez diyAudio Member Join Date: Jan 2004 Location: n.e england	oh it's an 8 alright.... have looked very carefully through a large magnifying glass at all 3 of them and yep, no doubt it's an 8. Looks like it will remain a mystery op-amp! __________________ Repairs and mods to Real Hi-Fi, guitar amps and P.A. in North East England. http://www.arklesselectronics.com

15th May 2012, 03:34 PM	#9
davebullock diyAudio Member Join Date: Sep 2011	AD40328 Hi B&KMeasuring Amplifier owners.... Looks like it's a B+K part number. The actual IC is an LM201AH. Slghtly less rare than unobtanium. I just replaced all my AD40328's with the aforementioned IC and the performance is great and up to B+K specification. Hope this helps other B+K owners. Dave

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